SYLGARD 184 Silicone Elastomer
Two-part PDMS elastomer · US · manufacturer-sourced
How long does DOWSIL (Dow) SYLGARD 184 Silicone Elastomer take to cure?
Short answer
Cast-and-demold plan
Gel, demold and full cure are separate days
- Mix the Two-part PDMS elastomer to ratio and pour
- Wait for the demold time
- Sand or finish after full cure
This product’s stated stages Quoted at 77°F
- Working time ends2 hours
- Full cure2 days
Worth noticing: Working time is only 2 hours; the next stated stage, full cure, is 2 days.
Common mistake: Demolding early and leaving a soft, tacky casting that never fully hardens.
Project stage ladder
Demolding, handling, finishing and final use may occur at different times
For microfluidics, electronics potting, and lab casting, identify which stage the stated cure 2 days milestone actually unlocks. Earlier handling does not prove final cure.
Time demold and cure
Your countdown
Stated times
- Working time ends2 hours
- Full cure2 days
From DOWSIL (Dow) data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.
Manufacturer website: dow.com
Conditions & fine print
- Stated conditions: 77°F (25°C)
- Pot life and cure times shorten in warm rooms and with larger batches. Follow the current data sheet and mixing instructions.
- Region US. Formulas can differ between countries; check your container.
- Working time ends: The source gives no conditions for this time.
- Full cure: At 25°C. At 100°C it is 45 minutes, at 125°C 20 minutes and at 150°C 10 minutes.
- Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
- Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.
Confirm this is your product
Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.
- Exact listing
- DOWSIL (Dow) SYLGARD 184 Silicone Elastomer
- Variant
- Two-part PDMS elastomer
- Region
- US
- Listed use
- microfluidics, electronics potting, lab casting
- Timed stages recorded
- tooling, full cure
- Source checked
- 2026-10-25
Documentation: Technical data sheet copy · Form 06-1009-01, 2007
Condition attached to the stated time: The source gives no conditions for this time.
About this product
The PDMS used in microfluidics labs. The data sheet gives 48 hours at room temperature or 45 minutes at 100°C, and notes the times are initial estimates that should be pretested. The sheet in this record is a 2007 Dow Corning copy.
Using this specific product
DOWSIL (Dow) SYLGARD 184 Silicone Elastomer is listed here as the Two-part PDMS elastomer version for microfluidics, electronics potting, and lab casting. For casting resin, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.
Before you start
- Confirm the package says Two-part PDMS elastomer; related versions can use different timing.
- For microfluidics, electronics potting, and lab casting, pay particular attention to accurate mixing, mold material, mass and room temperature.
- The source gives no conditions for this time. At 25°C. At 100°C it is 45 minutes, at 125°C 20 minutes and at 150°C 10 minutes.
How to check readiness
Check the casting itself for flex or tack before demolding. The data sheet gives a pot life of more than 2 hours. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.
Avoid this mistake
Demold time is not necessarily full mechanical cure.
Compare with similar products
- Compare with WiseBond Deep Pour EpoxyFull cure: 1.5–2 days there, 2 days here.
- Compare with Alumilite Amazing Clear Cast PlusFull cure: 3 days there, 2 days here.
Questions
How long does this product take to cure?
DOWSIL (Dow) states: The data sheet gives a pot life of more than 2 hours. Conditions: The source gives no conditions for this time.. The data sheet lists a cure of about 48 hours. Conditions: At 25°C. At 100°C it is 45 minutes, at 125°C 20 minutes and at 150°C 10 minutes.. These are the manufacturer’s stated times, not a guarantee.
How fast does Sylgard 184 cure in an oven?
45 minutes at 100°C, 20 minutes at 125°C and 10 minutes at 150°C, according to the sheet. At 25°C it takes about 48 hours.
How long do I have to work with this product?
DOWSIL (Dow) states: The data sheet gives a pot life of more than 2 hours. Conditions: The source gives no conditions for this time.. These are the manufacturer’s stated times, not a guarantee.
What affects how long this product takes to dry or cure?
Pot life and cure times shorten in warm rooms and with larger batches. Follow the current data sheet and mixing instructions. Follow the product label for your conditions.